x = int(input())
if x>=30:
    print("Yes")
else: print("No") x = int(input()) x int(input()) int input() input if x>=30:
    print("Yes")
else: print("No") x>=30 x 30 print("Yes") print "Yes" x = int(input()) int(input()) x
x = int(input())
if x>=30:
    print("Yes")
else: print("No")